Batch text-to-speech
Batch text-to-speech: synthesize up to 20 text items in a single call, standard voices only, for 501-2000 total characters, returns JSON with base64 WAV audio plus duration and sample rate per item. Use it to: batch-voice a longer set of messages, produce audio for a multi-section script or FAQ, generate several paragraph-length voice clips in one request without repeated calls. USDC on Base via x402.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
678 msmedian answer time
$0.005listed price per call
$0.005price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://voice.forgemesh.io/v1/tts/batch-long
| Category | Image and media |
|---|---|
| Provider host | voice.forgemesh.io |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 5 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 678 ms |
Example input (from the provider)
{
"body": {
"defaults": {
"lang": "en",
"voice": "F2"
},
"items": [
{
"text": "Hello"
},
{
"text": "World"
}
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"defaults": {
"additionalProperties": false,
"description": "Default standard voice and language for all items",
"properties": {
"lang": {
"description": "Language code; 31 languages supported",
"enum": [
"en",
"ko",
"ja",
"ar",
"bg",
"cs",
"da",
"de",
"el",
"es",
"et",
"fi",
"fr",
"hi",
"hr",
"hu",
"id",
"it",
"lt",
"lv",
"nl",
"pl",
"pt",
"ro",
"ru",
"sk",
"sl",
"sv",
"tr",
"uk",
"vi"
],
"type": "string"
},
"voice": {
"description": "Standard voice: M1-M5 or F1-F5",
"enum": [
"M1",
"M2",
"M3",
"M4",
"M5",
"F1",
"F2",
"F3",
"F4",
"F5"
],
"type": "string"
}
},
"type": "object"
},
"items": {
"description": "Array of standard-voice text items. Total text across all items must be <= 2000 characters; use /v1/tts/batch for <=500 total chars and /v1/tts/batch-long for 501-2000 total chars.",
"items": {
"additionalProperties": false,
"properties": {
"lang": {
"description": "Language code; 31 languages supported",
"enum": [
"en",
"ko",
"ja",
"ar",
"bg",
"cs",
"da",
"de",
"el",
"es",
"et",
"fi",
"fr",
"hi",
"hr",
"hu",
"id",
"it",
"lt",
"lv",
"nl",
"pl",
"pt",
"ro",
"ru",
"sk",
"sl",
"sv",
"tr",
"uk",
"vi"
],
"type": "string"
},
"text": {
"description": "Text for this batch item",
"maxLength": 2000,
"minLength": 1,
"type": "string"
},
"voice": {
"description": "Standard voice: M1-M5 or F1-F5",
"enum": [
"M1",
"M2",
"M3",
"M4",
"M5",
"F1",
"F2",
"F3",
"F4",
"F5"
],
"type": "string"
}
},
"required": [
"text"
],
"type": "object"
},
"maxItems": 20,
"minItems": 1,
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"items": {
"items": {
"properties": {
"audio_base64": {
"type": "string"
},
"duration_s": {
"type": "number"
},
"format": {
"type": "string"
},
"sample_rate": {
"type": "integer"
}
},
"type": "object"
},
"type": "array"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}